-83.66% is the change from 612 to 100
Calculation steps:
[( 100 - 612 ) ÷ 612] x 100 = -83.66%
Formula
Percentage change = [(100 - 612) / 612] x 100
Subtract the new number by the original number
100 - 612 = -512
-512 ÷ 612 = -0.8366013071895425
-0.8366013071895425 x 100 = -83.66%